US Patent: 339,456
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| Screw Driver
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Patentee:
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| William L. Parmelee (exact or similar names) - Birmingham, CT |
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Patent Dates:
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| Applied: |
Feb. 02, 1886 |
| Granted: |
Apr. 06, 1886 |
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Patent Pictures:
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William L. Parmelee patent April 6, 1886 |
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Stan Schulz
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Description: |
| The screwdriver blade can be rotated to a 90 degree angle to the handle for greater leverage. The reversible blade has a center slot which provides the range of motion needed to reverse the blade. The "bow" of the handle has a seat to hold the screwdriver blade when the blade is in line with the handle.
An April 1887 CARPENTRY & BUILDER write-up noted Parmelee was producing the screwdriver in three sizes. A known example is marked with the patent date. |
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